drawBot in RoboFont

previewer.py

from drawBot import *
from drawBot.ui.drawView import DrawView

from vanilla import *

class Previewer(object):
    
    def __init__(self):
        # setup the window
        self.w = Window((400, 400), "Previewer", minSize=(200, 200))
        # add a slider
        self.w.slider = Slider((10, 10, -10, 22), callback=self.sliderCallback, value=.5, minValue=0, maxValue=1)
        # add a pdf viewer
        self.w.result = DrawView((0, 40, -0, -0))
        # call the callback so it will draw just before opening the window
        self.sliderCallback(self.w.slider)
        # open the window
        self.w.open()
    
    def sliderCallback(self, sender):
        # get the value from the slider
        value = sender.get()
        # initiate a new drawing
        newDrawing()
        # set a size
        size(200, 200)
        fill(value, 1-value, 0)
        # draw a rectangle, the width and height is related to the slider
        rect(10, 10, (width() - 20) * value, (height() - 20) * value)
        # get the pdf document
        pdfDocument = pdfImage()
        # set the pdf document into the pdf viewer
        self.w.result.setPDFDocument(pdfDocument)

Previewer()